USB: UHCI: fix for suspend of virtual HP controller

HP's virtual UHCI host controller takes a long time to suspend
(several hundred microseconds), even when no devices are attached.
This provokes a warning message from uhci-hcd in the auto-stop case.

To prevent this from happening, this patch adds a test to avoid
performing an auto-stop when the wait_for_hp quirk flag is set. The
controller will still suspend through the normal runtime PM mechanism.
And since that pathway includes a 1-ms delay, the slowness of the
virtual hardware won't matter.

Signed-off-by: Alan Stern <[e-mail]>
Reported-and-tested-by: ZhenHua <[e-mail]>
CC: <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/uhci-hub.c

···
 		/* auto-stop if nothing connected for 1 second */
 		if (any_ports_active(uhci))
 			uhci->rh_state = UHCI_RH_RUNNING;
-		else if (time_after_eq(jiffies, uhci->auto_stop_time))
+		else if (time_after_eq(jiffies, uhci->auto_stop_time) &&
+				!uhci->wait_for_hp)
 			suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
 		break;